Authorities in Serbia and Bosnia say at least 20 people have died in the two nations from the record flooding that has hit the Balkans this week.

In the eastern Bosnian town of Bijeljina, some 10,000 people were being evacuated Saturday after the rain-swollen Sava River surged through flood defenses.

In Serbia, emergency crews and soldiers used boats and helicopters to rescue thousands more who had been trapped in the town of Obrenovac, near Belgrade. The overflowing waters there are now threatening Serbia's biggest power plant.

Meteorologists say the flooding is the worst since records began. Officials say they expect more casualties after the waters begin receding in the next few days.